Questions tagged [volumetrics]

Questions about rendering with volumes (smoke, fog, etc.). Use this tag for both Blender Internal and Cycles.

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4 votes
2 answers
768 views

Blender 2.81 Eevee lights clipping through objects when using volume shader

I want to use Eevee to render my animation in Blender 2.81. The animation involves lights behind/inside objects with one side open. When I add a cube to the scene with a Principled Volume shader in ...
0 votes
1 answer
128 views

Density field for volumes in geometry nodes

The "points to volume" etc in Geometry Nodes has a density input. This value is a single value, rather than a field. Is it even possible to store and use a regional density ? I've tried ...
0 votes
0 answers
83 views

Spot Light size in principled volume Bug in 4.0

I guess I find a bug, there is this strange thing when you combine principled volume with spotlight or point light. That you see a hard edge of the light. Its gone when you make a higher radius but ...
0 votes
0 answers
340 views

Regarding Blender's "Mesh to Volume" geometry node, is there a workaround for using density as an input like the volume cube?

For reference, I'm looking for an effect similar to Lee Griggs's work using Arnold but through blender's geometry node volume displacement tools. A good example would be their piece bifrost tim: https:...
0 votes
0 answers
7 views

Question on balancing different light sources- God rays

I am making this google logo ball of sorts. I want it to have volumetric lighting emphasising the geometry like in the picture. However I don´t want it to have too much light hitting the floor. I know ...
0 votes
1 answer
62 views

Render not maintaining transparency when using volumetric lighting (Cycles)

I have been working on a pre-rendered game for quite some time, and wanted to add an object to the game with a transparent background but still having and being affected by volumetric fog to match up ...
2 votes
1 answer
25 views

import VDB file and start the animation at a certain frame in your scene

Hi I have created a VDB file explosion and it looks great. I Have imported it into another project and it all works. This is using Blender 3.6 However I would like to change the frame that it appears ...
0 votes
1 answer
70 views

How can I improve my PSX/PS1 fog?

Blender: 3.62 Art Style: PS1/PSX Game: Ecco The Dolphin: Defender Of The Future I'm using the Principled Volume Shader on my World Node to achieve a colored fog effect. It's ok but i have 2 ...
1 vote
1 answer
492 views

Is there any way of manually creating volume grid data?

I would like to know if there is a way of manually creating volume grids. Like the data we obtain from mantaflow simulations or import from external vdb files. For example, is the creation of volume ...
0 votes
1 answer
23 views

How to loop an imported VDB file

Is there any way to loop an imported VDB file? I've imported a VDB that is set up to be looped from Janga FX. It is only 128 frames long, but I want to make it loop multiple times in Blender 3.5. Any ...
0 votes
1 answer
19 views

Light not affecting volumetric cube, but only in specific project file?

I have a project where I am trying to shine a light through a volumetric cube. Everything was working as expected until I unknowingly changed some setting which made it start behaving differently. ...
0 votes
0 answers
34 views

SDF Volumetric Morphing Noise in Density Problem

I've been following the tutorial you can find below: https://www.youtube.com/watch?v=9ubfb2K6mL0 Currently I am experiencing some sort of noise/artifacting problem near bounding boxes where I cannot ...
0 votes
0 answers
79 views

How to obtain a sort of "spherical fall-off" displacement?

I created two node trees that extrude a profile (a mesh made up of a few vertices, transformed into a curve, and to which a fillet is then applied to round the corners). They extrude it in such a way ...
0 votes
1 answer
273 views

Volumetrics render different in viewport vs final render

When using volume scatter on a massive cube, with an hdr image for lighting, I’m getting wildly different renders between what I see in my viewport vs what I get in my final render. I thought at ...
1 vote
0 answers
42 views

Why does Cycles volume rendering (absorption) seem to be tied to the objects/volume size?

So I have the same volume absorption material applied to cubes of different sizes. But the density seems to change based on the size of those objects, see attached image: A closeup of the material, ...
0 votes
2 answers
2k views

Volumetric Light not working on Cycles (but good in preview)

The volumetric Light shows pretty well in viewport preview, but doesn't render at all in Cycles. 4 point lights - Strength: 1000 A cube with a Volume Scatter / Density: 0.2 / Anisotrop: 0 I've made ...
0 votes
1 answer
304 views

render animation with eevee, volumetric disappear some frames

i have a bug with eevee when i rendering, my volumetric ambiance disappear sometimes without any reason. I noticed it once a sequence was rendered, some frame, totally random, i haven't my volumetric. ...
0 votes
1 answer
57 views

VBD volumes looks transparent (EEVEE)

So far I have not found anwer, VBD volumes looks of course good on Cycles, but i wanna use them for simple stuff on EEVEE, but, most of the times, they barely work or are visible on render, i moved ...
1 vote
1 answer
647 views

Volumetric cube works in preview but not when rendering

So I'm working on this scene in blender cycles. The scene consists of an underwater setting, where the camera dives to the bottom. I have two lights: the sun and an area light. The brightness of the ...
0 votes
0 answers
50 views

I want to use the color of one volume to color a mesh

Is there a way to use the color of a volume object to shade it? I haven't found anything online or when checking shaders and geo-nodes. Does anyone have an idea to solve this? I didn't understand on ...
0 votes
0 answers
22 views

Controlling the point opacity value & threshold in volumetrics VDB

I'm trying to duplicate 3D density plots from Mathematica into Blender. Within Mathematica, You can control the opacity threshold of rendered points - points with value below and above the threshold ...
2 votes
1 answer
924 views

Get vdb motion blur in blender (from embergen)

I made a basic fire and smoke simulation in embergen and exported it as a vdb sequence (with the velocity data). When I put it into blender I get three velocity float values instead of one float ...
1 vote
1 answer
172 views

principled Volume is visible in the render result but not in the saved picture

I can see the volume in the render result but when I open the png image in Photos it's invisible
0 votes
1 answer
373 views

Alpha Volume Scatter Weirdness

I have a volume scatter box (which is fog) which has a principled volume shader on it. I then have this barrel with a png image in front of it, i enabled the alpha... however the volume scatter box is ...
20 votes
4 answers
32k views

Rendering smoke in Cycles?

I am trying to render smoke in cycles, but the relevant blender manual page is designed for Bender Internal. I have everything set up except for the material. I imagine you would set up the material ...
2 votes
1 answer
929 views

Volumetric light without fog

I'm using blender 2.8. I was wondering is there any way to create volumetric light without fog (or just a little bit) ? There are some tutorials on Youtube but almost all of them are creating ...
0 votes
1 answer
2k views

Where is the volume step size option in Blender 2.83?

Here is a picture of what I see in the volumes dropdown: I tried going through all of the dropdowns in the render settings but still, no such luck.
0 votes
1 answer
158 views

How to fix background issue with cycles fog?

So, I used a cube to create the volumetric fog with volume scatter. The problem is that in the camera, the background is black instead of matching the fog. Is there any way to fix this? Is there ...
0 votes
1 answer
255 views

Volume Absorption is only applied to the "top" of a mesh

I am following the BlenderGuru tutorial of making a cup of coffee, but when I make the coffee liquid using volume absorption, the coffee only appears to absorb light from the top. When I adjust the ...
0 votes
0 answers
26 views

How to select a material or object using the cryptomate node if it is a volume

I have a cube in the scene that I have assigned a volumetric material to. Why can't I select it using the cryptomate node when composing a scene? All materials and objects in the scene are displayed, ...
2 votes
0 answers
21 views

Is there a way to change the volume scatter colour while only having a red light

Volume in blender is a brilliant way to give depth to a scene and can give gorgious god rays, but for the scene im working on i want a different colour fog around the light then the light itself, ...
0 votes
2 answers
311 views

Imported openVDB sequence from another scene moves around randomly

Like the title says, I did a smoke sim in another scene and tried to import the vdb sequence to a new one and the whole volume moves about semingly randomly, please help im ripping my hair out over ...
0 votes
1 answer
113 views

Is it possible to ‘blur attribute’ for volume cube density?

I’m using a combination of techniques within geometry nodes such as Ray casting, geometry proximity, to affect the density of a volume cube node. I’ve defined my density attribute, and I’d like to ...
0 votes
1 answer
309 views

Rendering problem on a procedural cloud

I created a procedural cloud with this tutorial : https://youtu.be/lCvP917Z8uc, but when I duplicate it to create a "Clouds carpet" the invisible cube from which I created my cloud causes my ...
0 votes
1 answer
239 views

Why isn't my principled volume registering texture inputs - Eevee

So I have been wanting to add animated ground fog to my scene in eevee in Blender 3.0, however I have come across this issue where any texture I add to my Principled volume's density input or emission ...
2 votes
1 answer
1k views

Volumetric light causes lights to flicker in eevee

I'm having a problem where the lights on my car (and the area lamp) are flickering when i play the animation. I used a cube with the principled volume settings and the flickering is only caused when ...
0 votes
1 answer
276 views

Unusual artefacts in volume render

I am using Blender 2.82a (Cycles) to create a fuzzy ball. However I am getting this strange ring of artefacts in the rendered image, where the alpha channel shows through - I am not getting the smooth ...
1 vote
2 answers
553 views

Principled Volume not working

As a beginner I am trying to follow a tutorial and learn by doing. My principle Volume doesnt work the way it is inteded to. Everything above 0 density makes everything appear white. I have searched ...
8 votes
2 answers
959 views

How to create high altitude clouds? (cirrus and cirrocumulus)

Pretty much all cloud tutorials show how to make Cumulus clouds, or some random blob of a cloud, but I'm looking to create high altitude clouds, which you can see below. I'm most interested in the ...
0 votes
3 answers
852 views

Blender - Transparency in render broken for areas of a volume

I have a render with transparent film that I ran. When it finished, it appeared completely fine in the Blender render viewer. It has glowing cloud-like parts where I attached an emission shader to the ...
0 votes
0 answers
15 views

Volume nodes not working for me on a macbook pro and EEVEE

I can't get anything in volume node output whatever I do it's still like it's just not connected to anything.
0 votes
2 answers
511 views

Using Proximity from Curve to control Volume Shader in Cube

I'm experimenting with the Geometry Proximity node in Geo Nodes, using Blender version 3.2.1. The effect I want to achieve is a volumetric shader within a cube domain that is controlled by the ...
0 votes
0 answers
18 views

how to render scene in blender with layer and volumetric atmosphere

I have a problem with rendering a scene correctly using layers. When I render it as a whole everything is fine. When I use layers I have a problem with volumetric atmosphere which obscures everything ...
0 votes
0 answers
24 views

Grease pencil bleeds through objects when volumetric is on in cycles

When grease pencil is used in a scene where volumetrics is on, some pixels of it bleed through the objects in front of it after the image has been rendered using cycles (even when Z pass is on) as ...
0 votes
0 answers
27 views

Horizontal lines showing up in volumetrics

These horizontal lines keep appearing in my render(doesnt appear in viewport). Incresing samples or volume bounces doesnt seem to fix it, Decreaing step rate doesnt aswell. Currently rendering in CUDA ...
0 votes
0 answers
17 views

Bright artifact where emissive flames intersect VDB. Can it be fixed?

I am animating a landing spacecraft with animated flames (procedural material) and an imported volumetric VDB for animating dust stirred up by the thrust. Issue: A bright artifact is created where the ...
0 votes
1 answer
21 views

Viewport and renderview images vastly different to saved image

I am working on a nebula image using volumetrics and evee. I am following a tutorial and everything works fine until I save the image sequence. The images are almost invisible compared to the viewport ...
0 votes
0 answers
27 views

Volumetrics + Composition creates lots of noise in cycles

Why does my render look like this? What setting do I need to increase to solve this? This started happening when I added the volumetrics. Here is my nodemap: And here are my render settings: This is ...
0 votes
0 answers
35 views

Is it possible to control the visibility and depth of objects inside the volume?

Is there a way to make the cube inside a foggy volume appear as if there is no volume at all? That is, it did not lose its contrast and was displayed normally and not vaguely. Is it possible to ...
0 votes
0 answers
21 views

How do I use bssrdf_gaussian and bssrdf_cubic in OSL?

I'm repeatedly getting errors reported that these functions are not defined, but they are explicitly mentioned here in the documentation. Everything else on this page has worked so far, including <...

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